ddb: qualify pointers whose dereferenced values are constant with const

29 files changed, 135 insertions, 134 deletions

diff --git a/ddb/db_aout.c b/ddb/db_aout.c
index 8ef7efb9..57c680a1 100644
--- a/ddb/db_aout.c
+++ b/ddb/db_aout.c
@@ -134,7 +134,7 @@ aout_db_sym_init(symtab, esymtab, name, task_addr)
  */
 private boolean_t
 aout_db_is_filename(name)
-	char *name;
+	const char *name;
 {
 	while (*name) {
 	    if (*name == '.') {
@@ -151,10 +151,10 @@ aout_db_is_filename(name)
  */
 private boolean_t
 aout_db_eq_name(sp, name)
-	struct nlist *sp;
-	char *name;
+	const struct nlist *sp;
+	const char *name;
 {
-	char *s1, *s2;
+	const char *s1, *s2;
 
 	s1 = sp->n_un.n_name;
 	s2 = name;
@@ -186,11 +186,11 @@ aout_db_eq_name(sp, name)
  */
 private struct nlist *
 aout_db_search_name(sp, ep, name, type, fp)
-	struct nlist 	*sp;
-	struct nlist	*ep;
-	char		*name;
-	int 		type;
-	struct nlist	**fp;
+	struct nlist 		*sp;
+	const struct nlist	*ep;
+	const char		*name;
+	int 			type;
+	struct nlist		**fp;
 {
 	struct nlist	*file_sp = *fp;
 	struct nlist	*found_sp = 0;
@@ -233,8 +233,8 @@ aout_db_search_name(sp, ep, name, type, fp)
 private db_sym_t
 aout_db_qualified_search(stab, file, sym, line)
 	db_symtab_t	*stab;
-	char		*file;
-	char		*sym;
+	const char	*file;
+	const char	*sym;
 	int 		line;
 {
 	struct nlist *sp = (struct nlist *)stab->start;
@@ -396,12 +396,12 @@ aout_db_symbol_values(stab, sym, namep, valuep)
  */
 private boolean_t
 aout_db_search_by_addr(stab, addr, file, func, line, diff)
-	db_symtab_t	*stab;
-	vm_offset_t 	addr;
-	char		**file;
-	char		**func;
-	int 	 	*line;
-	unsigned long	*diff;
+	const db_symtab_t	*stab;
+	vm_offset_t 		addr;
+	char			**file;
+	char			**func;
+	int 	 		*line;
+	unsigned long		*diff;
 {
 	struct nlist 	*sp;
 	struct nlist 	*line_sp, *func_sp, *file_sp, *line_func;
diff --git a/ddb/db_break.c b/ddb/db_break.c
index d8273ea5..e41834da 100644
--- a/ddb/db_break.c
+++ b/ddb/db_break.c
@@ -90,7 +90,7 @@ db_breakpoint_free(bkpt)
 
 static int
 db_add_thread_breakpoint(bkpt, task_thd, count, task_bpt)
-	db_breakpoint_t bkpt;
+	const db_breakpoint_t bkpt;
 	vm_offset_t task_thd;
 	int count;
 	boolean_t task_bpt;
@@ -156,8 +156,8 @@ db_delete_thread_breakpoint(bkpt, task_thd)
 
 static db_thread_breakpoint_t
 db_find_thread_breakpoint(bkpt, thread)
-	db_breakpoint_t bkpt;
-	thread_t thread;
+	const db_breakpoint_t bkpt;
+	const thread_t thread;
 {
 	db_thread_breakpoint_t tp;
 	task_t task = (thread == THREAD_NULL)? TASK_NULL: thread->task;
@@ -176,7 +176,7 @@ db_find_thread_breakpoint(bkpt, thread)
 
 db_thread_breakpoint_t
 db_find_thread_breakpoint_here(task, addr)
-	task_t		task;
+	const task_t	task;
 	db_addr_t	addr;
 {
 	db_breakpoint_t bkpt;
@@ -268,10 +268,10 @@ db_check_breakpoint_valid(void)
 
 db_breakpoint_t
 db_set_breakpoint(task, addr, count, thread, task_bpt)
-	task_t		task;
+	const task_t	task;
 	db_addr_t	addr;
 	int		count;
-	thread_t	thread;
+	const thread_t	thread;
 	boolean_t	task_bpt;
 {
 	db_breakpoint_t bkpt;
@@ -321,7 +321,7 @@ db_set_breakpoint(task, addr, count, thread, task_bpt)
 
 void
 db_delete_breakpoint(task, addr, task_thd)
-	task_t	task;
+	const task_t	task;
 	db_addr_t	addr;
 	vm_offset_t	task_thd;
 {
@@ -352,7 +352,7 @@ db_delete_breakpoint(task, addr, task_thd)
 
 db_breakpoint_t
 db_find_breakpoint(task, addr)
-	task_t	task;
+	const task_t	task;
 	db_addr_t	addr;
 {
 	db_breakpoint_t	bkpt;
@@ -368,7 +368,7 @@ db_find_breakpoint(task, addr)
 
 boolean_t
 db_find_breakpoint_here(task, addr)
-	task_t		task;
+	const task_t	task;
 	db_addr_t	addr;
 {
 	db_breakpoint_t	bkpt;
@@ -681,7 +681,7 @@ db_breakpoint_cmd(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	int n;
 	thread_t thread;
diff --git a/ddb/db_break.h b/ddb/db_break.h
index e323a5f4..ad861198 100644
--- a/ddb/db_break.h
+++ b/ddb/db_break.h
@@ -71,12 +71,12 @@ struct db_breakpoint {
 
 typedef struct db_breakpoint *db_breakpoint_t;
 
-extern db_breakpoint_t	db_find_breakpoint( task_t task, db_addr_t addr);
-extern boolean_t	db_find_breakpoint_here( task_t task, db_addr_t addr);
+extern db_breakpoint_t	db_find_breakpoint( const task_t task, db_addr_t addr);
+extern boolean_t	db_find_breakpoint_here( const task_t task, db_addr_t addr);
 extern void		db_set_breakpoints(void);
 extern void		db_clear_breakpoints(void);
 extern db_thread_breakpoint_t	db_find_thread_breakpoint_here
-					( task_t task, db_addr_t addr );
+					( const task_t task, db_addr_t addr );
 extern db_thread_breakpoint_t	db_find_breakpoint_number
 					( int num, db_breakpoint_t *bkptp);
 
@@ -84,8 +84,8 @@ extern db_breakpoint_t	db_set_temp_breakpoint( task_t task, db_addr_t addr);
 extern void		db_delete_temp_breakpoint
 					( task_t task, db_breakpoint_t bkpt);
 
-extern db_breakpoint_t  db_set_breakpoint(task_t task, db_addr_t addr, 
-					  int count, thread_t thread, 
+extern db_breakpoint_t  db_set_breakpoint(const task_t task, db_addr_t addr, 
+					  int count, const thread_t thread, 
 					  boolean_t task_bpt);
 
 void db_listbreak_cmd();
@@ -96,7 +96,7 @@ void db_breakpoint_cmd(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 extern void db_check_breakpoint_valid(void);
 
diff --git a/ddb/db_command.c b/ddb/db_command.c
index 85cbf816..3257e073 100644
--- a/ddb/db_command.c
+++ b/ddb/db_command.c
@@ -95,15 +95,15 @@ boolean_t	db_ed_style = TRUE;
  */
 int
 db_cmd_search(name, table, cmdp)
-	char *		name;
-	struct db_command	*table;
-	struct db_command	**cmdp;	/* out */
+	const char *		name;
+	const struct db_command	*table;
+	const struct db_command	**cmdp;	/* out */
 {
-	struct db_command	*cmd;
+	const struct db_command	*cmd;
 	int		result = CMD_NONE;
 
 	for (cmd = table; cmd->name != 0; cmd++) {
-	    char *lp;
+	    const char *lp;
 	    char *rp;
 	    int  c;
 
@@ -142,9 +142,9 @@ db_cmd_search(name, table, cmdp)
 
 void
 db_cmd_list(table)
-	struct db_command *table;
+	const struct db_command *table;
 {
-	struct db_command *cmd;
+	const struct db_command *cmd;
 
 	for (cmd = table; cmd->name != 0; cmd++) {
 	    db_printf("%-12s", cmd->name);
@@ -447,7 +447,7 @@ db_exec_cmd_nest(cmd, size)
 }
 
 void db_error(s)
-	char *s;
+	const char *s;
 {
 	extern int db_macro_level;
 
@@ -524,10 +524,10 @@ db_fncall(void)
 
 boolean_t
 db_option(modif, option)
-	char	*modif;
-	int	option;
+	const char	*modif;
+	int		option;
 {
-	char *p;
+	const char *p;
 
 	for (p = modif; *p; p++)
 	    if (*p == option)
diff --git a/ddb/db_command.h b/ddb/db_command.h
index 30e1f21e..5f0236a7 100644
--- a/ddb/db_command.h
+++ b/ddb/db_command.h
@@ -41,9 +41,9 @@
 #include <machine/setjmp.h>
 
 extern void		db_command_loop(void);
-extern boolean_t	db_option(char *, int);
+extern boolean_t	db_option(const char *, int);
 
-extern void		db_error(char *);	/* report error */
+extern void		db_error(const char *);	/* report error */
 
 extern db_addr_t	db_dot;		/* current location */
 extern db_addr_t	db_last_addr;	/* last explicit address typed */
diff --git a/ddb/db_cond.c b/ddb/db_cond.c
index ae52bef8..2c923b4d 100644
--- a/ddb/db_cond.c
+++ b/ddb/db_cond.c
@@ -105,7 +105,7 @@ db_cond_check(bkpt)
 
 void
 db_cond_print(bkpt)
-	db_thread_breakpoint_t bkpt;
+	const db_thread_breakpoint_t bkpt;
 {
 	char *p, *ep;
 	struct db_cond *cp;
diff --git a/ddb/db_cond.h b/ddb/db_cond.h
index dec4967d..6b9c3a5b 100644
--- a/ddb/db_cond.h
+++ b/ddb/db_cond.h
@@ -24,7 +24,7 @@
 #include <sys/types.h>
 #include <machine/db_machdep.h>
 
-extern void db_cond_free (db_thread_breakpoint_t bkpt);
+extern void db_cond_free (const db_thread_breakpoint_t bkpt);
 
 extern boolean_t db_cond_check (db_thread_breakpoint_t bkpt);
 
diff --git a/ddb/db_examine.c b/ddb/db_examine.c
index 6e7f89cc..cb103aed 100644
--- a/ddb/db_examine.c
+++ b/ddb/db_examine.c
@@ -62,7 +62,7 @@ db_examine_cmd(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	thread_t	thread;
 
@@ -94,7 +94,7 @@ db_examine_forward(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	db_examine(db_next, db_examine_format, db_examine_count,
 				db_thread_to_task(db_examine_thread));
@@ -106,7 +106,7 @@ db_examine_backward(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 
 	db_examine(db_examine_prev_addr - (db_next - db_examine_prev_addr),
@@ -117,7 +117,7 @@ db_examine_backward(addr, have_addr, count, modif)
 void
 db_examine(addr, fmt, count, task)
 	db_addr_t	addr;
-	char *		fmt;	/* format string */
+	const char *	fmt;	/* format string */
 	int		count;	/* repeat count */
 	task_t		task;
 {
@@ -125,7 +125,7 @@ db_examine(addr, fmt, count, task)
 	db_expr_t	value;
 	int		size;	/* in bytes */
 	int		width;
-	char *		fp;
+	const char *	fp;
 
 	db_examine_prev_addr = addr;
 	while (--count >= 0) {
@@ -333,7 +333,7 @@ db_print_loc_and_inst(loc, task)
 void
 db_strcpy(dst, src)
 	char *dst;
-	char *src;
+	const char *src;
 {
 	while ((*dst++ = *src++))
 	    ;
diff --git a/ddb/db_examine.h b/ddb/db_examine.h
index e4f34155..df578a02 100644
--- a/ddb/db_examine.h
+++ b/ddb/db_examine.h
@@ -29,13 +29,13 @@ extern void db_examine_cmd (
 	db_expr_t addr, 
 	int have_addr, 
 	db_expr_t count,
-	char *modif);
+	const char *modif);
 
-extern void db_strcpy (char *dst, char *src);
+extern void db_strcpy (char *dst, const char *src);
 
 extern void db_examine (
 	db_addr_t addr,
-	char *fmt,
+	const char *fmt,
 	int count,
 	task_t task);
 
@@ -43,13 +43,13 @@ void db_examine_forward(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 void db_examine_backward(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 extern void db_print_loc_and_inst (
 	db_addr_t loc,
diff --git a/ddb/db_expr.c b/ddb/db_expr.c
index 82ada586..dad09e5c 100644
--- a/ddb/db_expr.c
+++ b/ddb/db_expr.c
@@ -95,12 +95,12 @@ db_term(valuep)
 
 int
 db_size_option(modif, u_option, t_option)
-	char *modif;
+	const char *modif;
 	boolean_t *u_option;
 	boolean_t *t_option;
 {
-	char 	*p;
-	int	size = sizeof(int);
+	const char 	*p;
+	int		size = sizeof(int);
 
 	*u_option = FALSE;
 	*t_option = FALSE;
diff --git a/ddb/db_expr.h b/ddb/db_expr.h
index 989b66be..9c304e69 100644
--- a/ddb/db_expr.h
+++ b/ddb/db_expr.h
@@ -17,7 +17,7 @@
  */
 
 int db_size_option(
-	char		*modif,
+	const char	*modif,
 	boolean_t	*u_option,
 	boolean_t	*t_option);
 
diff --git a/ddb/db_input.c b/ddb/db_input.c
index 5be3a8ad..f908705d 100644
--- a/ddb/db_input.c
+++ b/ddb/db_input.c
@@ -69,8 +69,8 @@ char *  db_history_prev = (char *) 0;	/* start of previous line */
 
 void
 db_putstring(s, count)
-	char	*s;
-	int	count;
+	const char	*s;
+	int		count;
 {
 	while (--count >= 0)
 	    cnputc(*s++);
diff --git a/ddb/db_lex.c b/ddb/db_lex.c
index 203472d0..e7f67d29 100644
--- a/ddb/db_lex.c
+++ b/ddb/db_lex.c
@@ -50,7 +50,7 @@ db_expr_t db_look_token = 0;
 
 int
 db_read_line(repeat_last)
-	char	*repeat_last;
+	const char	*repeat_last;
 {
 	int	i;
 
@@ -105,7 +105,7 @@ db_save_lex_context(lp)
 
 void
 db_restore_lex_context(lp)
-	struct db_lex_context *lp;
+	const struct db_lex_context *lp;
 {
 	db_lp = lp->l_ptr;
 	db_last_lp = db_lp;
diff --git a/ddb/db_lex.h b/ddb/db_lex.h
index 5900122f..f7677df8 100644
--- a/ddb/db_lex.h
+++ b/ddb/db_lex.h
@@ -45,7 +45,7 @@ struct db_lex_context {
 };
 
 extern int	db_lex(void);
-extern int	db_read_line(char *rep_str);
+extern int	db_read_line(const char *rep_str);
 extern void	db_flush_line(void);
 extern int	db_read_char(void);
 extern void	db_unread_char(int c);
@@ -54,7 +54,7 @@ extern void	db_unread_token(int t);
 extern void	db_flush_lex(void);
 extern void	db_switch_input(char *, int);
 extern void	db_save_lex_context(struct db_lex_context *);
-extern void	db_restore_lex_context(struct db_lex_context *);
+extern void	db_restore_lex_context(const struct db_lex_context *);
 extern void	db_skip_to_eol(void);
 
 extern db_expr_t db_tok_number;
diff --git a/ddb/db_macro.c b/ddb/db_macro.c
index f985679e..e22f6bf3 100644
--- a/ddb/db_macro.c
+++ b/ddb/db_macro.c
@@ -59,7 +59,7 @@ db_expr_t	db_macro_args[DB_MACRO_LEVEL][DB_NARGS];
 
 static struct db_user_macro *
 db_lookup_macro(name)
-	char *name;
+	const char *name;
 {
 	struct db_user_macro *mp;
 
@@ -141,7 +141,7 @@ db_show_macro(void)
 
 int
 db_exec_macro(name)
-	char *name;
+	const char *name;
 {
 	struct db_user_macro *mp;
 	int n;
diff --git a/ddb/db_macro.h b/ddb/db_macro.h
index 525eead3..2c0a599b 100644
--- a/ddb/db_macro.h
+++ b/ddb/db_macro.h
@@ -30,7 +30,7 @@ extern void db_del_macro_cmd (void);
 
 extern void db_show_macro (void);
 
-extern int db_exec_macro (char *name);
+extern int db_exec_macro (const char *name);
 
 extern void db_arg_variable (
 	struct db_variable *vp,
diff --git a/ddb/db_print.c b/ddb/db_print.c
index fbc09608..17ca2ccf 100644
--- a/ddb/db_print.c
+++ b/ddb/db_print.c
@@ -127,8 +127,8 @@ db_show_regs(addr, have_addr, count, modif)
 
 char *
 db_thread_stat(thread, status)
-	thread_t thread;
-	char	 *status;
+	const thread_t 	thread;
+	char	 	*status;
 {
 	char *p = status;
 
@@ -281,7 +281,7 @@ db_show_all_threads(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	boolean_t	have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	task_t task;
 	int task_id;
@@ -332,7 +332,7 @@ db_show_one_thread(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	boolean_t	have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	int		flag;
 	int		thread_id;
@@ -378,7 +378,7 @@ db_show_one_task(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	boolean_t	have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	int		flag;
 	int		task_id;
@@ -410,7 +410,7 @@ db_show_one_task(addr, have_addr, count, modif)
 
 int
 db_port_iterate(thread, func)
-	thread_t thread;
+	const thread_t thread;
 	void (*func)();
 {
 	ipc_entry_t entry;
@@ -452,7 +452,7 @@ db_lookup_port(thread, id)
 static void
 db_print_port_id(id, port, bits, n)
 	int id;
-	ipc_port_t port;
+	const ipc_port_t port;
 	unsigned bits;
 	int n;
 {
@@ -466,7 +466,7 @@ db_print_port_id(id, port, bits, n)
 static void
 db_print_port_id_long(
 	int id,
-	ipc_port_t port,
+	const ipc_port_t port,
 	unsigned bits,
 	int n)
 {
@@ -484,7 +484,7 @@ db_show_port_id(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	boolean_t	have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	thread_t thread;
 
diff --git a/ddb/db_print.h b/ddb/db_print.h
index 898014e8..dacb47b8 100644
--- a/ddb/db_print.h
+++ b/ddb/db_print.h
@@ -24,25 +24,25 @@ void db_show_one_task(
 	db_expr_t	addr,
 	boolean_t	have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 void db_show_port_id(
 	db_expr_t	addr,
 	boolean_t	have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 void db_show_one_thread(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 void db_show_all_threads(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 db_addr_t db_task_from_space(
 	ipc_space_t	space,
diff --git a/ddb/db_run.c b/ddb/db_run.c
index 09786673..945d097a 100644
--- a/ddb/db_run.c
+++ b/ddb/db_run.c
@@ -251,8 +251,8 @@ db_breakpoint_t	db_taken_bkpt = 0;
 
 db_breakpoint_t
 db_find_temp_breakpoint(task, addr)
-	task_t		   task;
-	db_addr_t	   addr;
+	const task_t	task;
+	db_addr_t	addr;
 {
 	if (db_taken_bkpt && (db_taken_bkpt->address == addr) &&
 	    db_taken_bkpt->task == task)
@@ -265,8 +265,8 @@ db_find_temp_breakpoint(task, addr)
 
 void
 db_set_task_single_step(regs, task)
-	db_regs_t *regs;
-	task_t		   task;
+	db_regs_t 	*regs;
+	task_t		task;
 {
 	db_addr_t pc = PC_REGS(regs), brpc;
 	unsigned int	inst;
@@ -310,8 +310,8 @@ db_set_task_single_step(regs, task)
 
 void
 db_clear_task_single_step(regs, task)
-	db_regs_t *regs;
-	task_t	  task;
+	const db_regs_t *regs;
+	task_t	  	task;
 {
 	if (db_taken_bkpt != 0) {
 	    db_delete_temp_breakpoint(task, db_taken_bkpt);
@@ -335,7 +335,7 @@ db_single_step_cmd(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	boolean_t	print = FALSE;
 
@@ -363,7 +363,7 @@ db_trace_until_call_cmd(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	boolean_t	print = FALSE;
 
@@ -386,7 +386,7 @@ db_trace_until_matching_cmd(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	boolean_t	print = FALSE;
 
@@ -411,7 +411,7 @@ db_continue_cmd(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	if (modif[0] == 'c')
 	    db_run_mode = STEP_COUNT;
diff --git a/ddb/db_run.h b/ddb/db_run.h
index 0c552799..c042d4ca 100644
--- a/ddb/db_run.h
+++ b/ddb/db_run.h
@@ -46,27 +46,27 @@ extern void db_single_step(db_regs_t *regs, task_t task);
 
 extern void db_single_step_cmd(
 	db_expr_t	addr,
-	int			have_addr,
+	int		have_addr,
 	db_expr_t	count,
-	char		*modif);
+	const char	*modif);
 
 void db_trace_until_call_cmd(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 void db_trace_until_matching_cmd(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 void db_continue_cmd(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 #ifndef db_set_single_step
 void		db_set_task_single_step(db_regs_t *, task_t);
@@ -74,7 +74,7 @@ void		db_set_task_single_step(db_regs_t *, task_t);
 #define	db_set_task_single_step(regs, task)	db_set_single_step(regs)
 #endif
 #ifndef db_clear_single_step
-void		db_clear_task_single_step(db_regs_t *, task_t);
+void		db_clear_task_single_step(const db_regs_t *, task_t);
 #else
 #define db_clear_task_single_step(regs, task)	db_clear_single_step(regs)
 #endif
diff --git a/ddb/db_sym.c b/ddb/db_sym.c
index e801e627..bbf14bdb 100644
--- a/ddb/db_sym.c
+++ b/ddb/db_sym.c
@@ -90,8 +90,8 @@ db_add_symbol_table(type, start, end, name, ref, map_pointer)
  */
 static char *
 db_qualify(symname, symtabname)
-	char		*symname;
-	char		*symtabname;
+	const char	*symname;
+	const char	*symtabname;
 {
 	static char     tmp[256];
 	char		*s;
@@ -108,7 +108,7 @@ db_qualify(symname, symtabname)
 
 
 boolean_t
-db_eqname( char* src, char* dst, char c )
+db_eqname( const char* src, const char* dst, char c )
 {
 	if (!strcmp(src, dst))
 	    return (TRUE);
diff --git a/ddb/db_sym.h b/ddb/db_sym.h
index cb574dd4..2c3e10a6 100644
--- a/ddb/db_sym.h
+++ b/ddb/db_sym.h
@@ -161,7 +161,7 @@ extern void	db_symbol_values( db_symtab_t *stab,
 	db_search_task_symbol(val,strgy,offp,0)
 
 /* strcmp, modulo leading char */
-extern boolean_t	db_eqname( char* src, char* dst, char c );
+extern boolean_t	db_eqname( const char* src, const char* dst, char c );
 
 /* print closest symbol to a value */
 extern void	db_task_printsym( db_addr_t off,
diff --git a/ddb/db_task_thread.c b/ddb/db_task_thread.c
index f420b8d9..266b1ea7 100644
--- a/ddb/db_task_thread.c
+++ b/ddb/db_task_thread.c
@@ -52,7 +52,7 @@ thread_t	db_default_thread;	/* default target thread */
  */
 int
 db_lookup_task(target_task)
-	task_t target_task;
+	const task_t target_task;
 {
 	task_t task;
 	int task_id;
@@ -82,8 +82,8 @@ db_lookup_task(target_task)
  */
 int
 db_lookup_task_thread(task, target_thread)
-	task_t	 task;
-	thread_t target_thread;
+	const task_t	 task;
+	const thread_t target_thread;
 {
 	thread_t thread;
 	int thread_id;
@@ -106,7 +106,7 @@ db_lookup_task_thread(task, target_thread)
  */
 int
 db_lookup_thread(target_thread)
-	thread_t target_thread;
+	const thread_t target_thread;
 {
 	int thread_id;
 	task_t task;
@@ -139,7 +139,7 @@ db_lookup_thread(target_thread)
  */
 boolean_t
 db_check_thread_address_valid(thread)
-	thread_t thread;
+	const thread_t thread;
 {
 	if (db_lookup_thread(thread) < 0) {
 	    db_printf("Bad thread address 0x%x\n", thread);
@@ -247,10 +247,10 @@ db_init_default_thread(void)
 /* ARGSUSED */
 void
 db_set_default_thread(vp, valuep, flag, ap)
-	struct db_variable *vp;
-	db_expr_t	*valuep;
-	int		flag;
-	db_var_aux_param_t	ap;
+	struct db_variable 	*vp;
+	db_expr_t		*valuep;
+	int			flag;
+	db_var_aux_param_t 	ap;
 {
 	thread_t	thread;
 
diff --git a/ddb/db_task_thread.h b/ddb/db_task_thread.h
index e6ae114a..cbb36802 100644
--- a/ddb/db_task_thread.h
+++ b/ddb/db_task_thread.h
@@ -43,10 +43,10 @@
 extern task_t	db_default_task;		/* default target task */
 extern thread_t	db_default_thread;		/* default target thread */
 
-extern int		db_lookup_task(task_t);
-extern int		db_lookup_thread(thread_t);
-extern int		db_lookup_task_thread(task_t, thread_t);
-extern boolean_t	db_check_thread_address_valid(thread_t);
+extern int		db_lookup_task(const task_t);
+extern int		db_lookup_thread(const thread_t);
+extern int		db_lookup_task_thread(const task_t, const thread_t);
+extern boolean_t	db_check_thread_address_valid(const thread_t);
 extern boolean_t	db_get_next_thread(thread_t *, int);
 extern void		db_init_default_thread(void);
 
diff --git a/ddb/db_variables.c b/ddb/db_variables.c
index 9d77c0a5..7f5a2c9b 100644
--- a/ddb/db_variables.c
+++ b/ddb/db_variables.c
@@ -68,9 +68,9 @@ struct db_variable db_vars[] = {
 };
 struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
 
-char *
+const char *
 db_get_suffix(suffix, suffix_value)
-	char		*suffix;
+	const char	*suffix;
 	short		*suffix_value;
 {
 	int value;
@@ -90,9 +90,10 @@ static boolean_t
 db_cmp_variable_name(vp, name, ap)
 	struct db_variable		*vp;
 	char				*name;
-	db_var_aux_param_t		ap;
+	const db_var_aux_param_t	ap;
 {
-	char *var_np, *np;
+	char *var_np;
+	const char *np;
 	int level;
 
 	for (np = name, var_np = vp->name; *var_np; ) {
diff --git a/ddb/db_watch.c b/ddb/db_watch.c
index 567040c1..c8a42868 100644
--- a/ddb/db_watch.c
+++ b/ddb/db_watch.c
@@ -93,7 +93,7 @@ db_watchpoint_free(watch)
 
 void
 db_set_watchpoint(task, addr, size)
-	task_t		task;
+	const task_t	task;
 	db_addr_t	addr;
 	vm_size_t	size;
 {
@@ -130,7 +130,7 @@ db_set_watchpoint(task, addr, size)
 
 void
 db_delete_watchpoint(task, addr)
-	task_t		task;
+	const task_t	task;
 	db_addr_t	addr;
 {
 	db_watchpoint_t	watch;
@@ -179,7 +179,7 @@ db_list_watchpoints(void)
 
 static int
 db_get_task(modif, taskp, addr)
-	char		*modif;
+	const char	*modif;
 	task_t		*taskp;
 	db_addr_t	addr;
 {
@@ -221,7 +221,7 @@ db_deletewatch_cmd(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	task_t		task;
 
@@ -237,7 +237,7 @@ db_watchpoint_cmd(addr, have_addr, count, modif)
 	db_expr_t	addr;
 	int		have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	vm_size_t	size;
 	db_expr_t	value;
diff --git a/ddb/db_watch.h b/ddb/db_watch.h
index 8e0f32fb..7ef1a207 100644
--- a/ddb/db_watch.h
+++ b/ddb/db_watch.h
@@ -49,12 +49,12 @@ typedef struct db_watchpoint {
 } *db_watchpoint_t;
 
 extern boolean_t db_find_watchpoint(vm_map_t map, db_addr_t addr,
-				     db_regs_t *regs);
+				    db_regs_t *regs);
 extern void db_set_watchpoints(void);
 extern void db_clear_watchpoints(void);
 
-extern void db_set_watchpoint(task_t task, db_addr_t addr, vm_size_t size);
-extern void db_delete_watchpoint(task_t task, db_addr_t addr);
+extern void db_set_watchpoint(const task_t task, db_addr_t addr, vm_size_t size);
+extern void db_delete_watchpoint(const task_t task, db_addr_t addr);
 extern void db_list_watchpoints(void);
 
 void db_listwatch_cmd(void);
@@ -63,13 +63,13 @@ void db_deletewatch_cmd(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 void db_watchpoint_cmd(
 	db_expr_t	addr,
 	int		have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 #endif	/* _DDB_DB_WATCH_ */
 
diff --git a/ddb/db_write_cmd.c b/ddb/db_write_cmd.c
index 1908005a..46a2ee32 100644
--- a/ddb/db_write_cmd.c
+++ b/ddb/db_write_cmd.c
@@ -55,7 +55,7 @@ db_write_cmd(address, have_addr, count, modif)
 	db_expr_t	address;
 	boolean_t	have_addr;
 	db_expr_t	count;
-	char *		modif;
+	const char *	modif;
 {
 	db_addr_t	addr;
 	db_expr_t	old_value;
diff --git a/ddb/db_write_cmd.h b/ddb/db_write_cmd.h
index 056be470..3a1d0575 100644
--- a/ddb/db_write_cmd.h
+++ b/ddb/db_write_cmd.h
@@ -29,6 +29,6 @@ void db_write_cmd(
 	db_expr_t	address,
 	boolean_t	have_addr,
 	db_expr_t	count,
-	char *		modif);
+	const char *	modif);
 
 #endif	/* !_DDB_DB_WRITE_CMD_H_ */